Telephone repeater circuits



Nov. 13, 1923. 1,474,038

E. D. JOHNSON TELEPHONE REPEATER CIRCUITS Original Filed Jan. 4. 1918 55 z; L :6 =12 26 52 W zlnvenfor: Edgar D. Johnson by W My Patented Nov. 13, 1923.

UNITED 'STATESHPATENT OFFICE.

EDGAR D. JOHNSON, OF EAST ORANGE, NEW JERSEY, ASSIGNOR T WESTERN ELEC- TRIO COMPANY, INCOI EI'ORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW Application filed January 4, 1918, Serial To all whom it may concern.

Be itknownthat I, EnoAn D. JOHNSON, a citizen of the United States, residin at East Orange, in the county of Essex, tate of NewJersey, have invented certain new and useful Improvements in Telephone Repeater Circuits, of which the following is a full, clear, concise and exact descri tlon.

Ear y.in the evelopment of telephone apparatus, it was recognized as desira 1e to increase the distance that si a'ls -could be transmitted, figs repeating. d? for this purp A repeater is essentially a unilateral conductor, however, whereas it is necessary to provide for the. two-way-trans=- mission of signals.v ffliis'leiids to the use of: first, repeaters perinanentlyoonnected in the I telephonelinqand prevented from by means of balancingmtworks, or, secon repeaters which are connRtedwto-lthdielt phone line in. one mannerfor 1 transmission in one direction and'connected in another manner; for transmission in the other directi I i ,1 Z

- This invention relates to'expe'dients of the latter type, wherein the swltching. of the repeater is automa efiected to current such avoice currentuimp on the telephone,%;e. I, The inventiofprdyidesga :single repeating a device which is normal! connected between the two terminals of the telephone line for transmission in one direction, a reversing switch being provided between each, tele- 3 phone line and the repeater. A voioe relay' is. connected. in shunt to each -of the telephone lines and theioperation' of either ofthe voice relays servesto render the other inoperative arfd changes the connections, of the repeater to the line terminals, in case it is necessary "that such change be; made for transmission of current in theproper irection. Upon-the cessation of roles current in the telephone line the repeater remains nor- 4!! mally connected to transmit current-in one direction throu h the telephone lines.

For further etails of the invention reference is made to the drawing, in which the signal figure shows diagrammatically a twoway repeating circuit embodying the in-' vention.

In the drawin the telephone lines 1 and 2 terminate in t e electromagnetic switches 3 and 4 respectively, which are adapted to vice. was used to e teleph'oiie'line 2.

TELEPHONE REPEATEB CIRCUITS.

1T0. 210,283. Renewed April 28, 1923.

properlyconnect the telephone lines to the repeater 5. This repeater is here shown as of'the mechanical type, but any other type of. repeater may be employed. The input leads 6 and. 7 of the repeater are connected to the lines 8 and 9 respectively. The lines 8 and 9 terminate in the contacts 10 and 11 of the switch 3, the circuit through these contacts being completed as shown by means of the armature-s12 and 13. The input side of the re eater 5 is thus connected to the line I throng the contacts 10 and 11 and their associated armatures. The output side of the repeater, by means of the leads 16 and 17, -is, connected to the contacts 18 and 19 which are in contact with their respective armatures'20 and 21 as shown. The armatures 12, 13, 20 and-21 are normally in their outermoshposition's as shown. The armstures 20 and 21 are permanently. connected the position of switches 3 and 4, shown,

the repeater 5 is adapted to receive current coming into the line 1 and to repeat this current'withamplified energy to t e line 2. In order to transmit current from the line 2 to the line 1, hewever, it is necessary to effect the o ration of svntches 3 and 4 to their alterna positions -apd this is done automatically b means which will now be described.

In nut to thetelephone line 1 is an alternating current relay or a voice relay 22, which is responsive to alternating or pu1sat xfig current, such as voice current, to cause e tactsr23 and 24. The invention is not limited to any particular form. of voice relay and as indicating one type of relay that may be employed, reference 18 made to the patent to Brown 1,185,472, telephony, May 30, 1916. The contact 24 is grounded, as shown, and thecontact 23 is connected by way of lead 25 through one solenoid 26 of a polarized relay or master switch 27. A circuit is rovided from the solenoid 26 through the attei'y 28 to round, as shown. The voice relay 29, similar to 22, is connected in' shunt to theline 2 and-is provided with the vibrating contacts 30 and 31 which are connected in series with the solenoid 32 of the polarized relay, the latter solenoid being also supplied with current from the battery 28 by connections as shown. v

The solenoids '33 and 34 of the electro- -vibration of its normally closed con When the-armature 37 oft e polarized relay 2'! is thus in its alternate position the but: tery 28 energizes the solenoids 33 and 34, thereby attracting armatures 12, 13, 20 and 21,

which connects'the input side of the'repeuteiflf 5 to the line 2, and the output side of the repeater 5 to the line 1. This makes possible I the transmission of current from theline2 through the repeater 5 totlic line-1.: The. operation of the olarized 27 is automatically eifected inresponse'to voice currents in the following way: voice currents coming in over the line 2 energize the voice relay 29, the contacts 30 and 31 of which are vibrated, thereby increasing theresiStnnc-e in the circuit 'inwhich the are included, this circuit comprisi the so enoid 32 of the polarized relay 27 an the battery 28.. This increase in res stance of the circu tiincluding solenoid 32 sutliciently reduces the gcurren through the same, so that the magnetic fiel produced b the; other solenoid 26 is efiective to .throw t e armature 37 to -its" alternate; position, in which position 1t efi'ects;- the',

operation of theswitches 3 and.47'as desired;

The operation of the voice relay i29, by means ofthe vibration of its contacts, also increases the resistance in acircu-it includin the solenoid of a relay 38, the armature 3 of which is connected in series with the solenoid oi the voice relay 22. When the current'through the relay 38 is thus decreased, the armaturef 39 assumes its open position, thereby openin thecircuit to the voice re- 1 la 22 were ering the sa'me inoperative.

T evoioe relay 22. is consequently.-maintained inoperative by the voice why 29 as long as the current is coming in over theline 2. r a i If, with the switches in the position shown in the drawing, current were to. come in over the line 1, the voice relay 22 would operate.

toflecr'ease the current throu h these e'noid 26 of relay 27, but this woul not effect the operation of the armature 37 and the switches 3 and 4 would maintain tions shown. The operation of the voice relay.22 would also increase the resistance in the circuit of the relay 41, thereby releasing the armature 42,-and opening up the circuit of the voice relay 29 which is consequently rendered inoperative.

-When current is no longer coming in over" either of the lines 1 or 2, the armatures 39 and 42 are attracted totheir closed positions due lays 22 and 29 are both to the increase in current thr'ouglf their corresponding solenoids the vibrating contacts being quiescent,wherehy the voice reconnected in shunt to their res active lines. The master switch or polariz relay 27 remains in the position the pom-- which it last assumed and in um position,

terminating in armatures, electromagnetic means for controlling said armatures, vibratile contact relays for controlling said means, a repeater between-said lines, means whereby said relays control .said repeater, and means whereby one of said relays controlsthe op'eratiomof another of said relays, said repeater bein'gconnected to transimt current in-: onl -.one direction between {said lines in the." absence or current -to be i P flt d-t i l; 4

2412mm ingsystem comprising two .telepho'nej ;;lin es terminating electromagnetic means for i controlling Jsaid armaturesyivibratile contact relays for controlling .said means, a repeater comprising an input-circuit and an outputiif rcuit adapted to between sald rlanes and eontrolle bygisaid iu elaysgeaehirelay being "uesponsiv'e c eamer in; its corresponding lineto rendijthe' othen-relayinoperative,

and said armatures'xoonnect' se'nd input 1.. The combination of two telephone lines 1n armatures,

,Qllfillllis to .one pf'said an connecting -'said outpntcircuit across said other line to condition the system for transmission in one direction over said lines in the absence of current to be repeated.

'3. A. signaling system com rising two lines, a vibratilecontact'AIC. risay shunt to each of said lines, a repeater for said lines and normally adapted to repeat, from one .of said lines to the other, means whereby said and an armature controlled there y, a source -of current in circuit'with'said contact and solenoid, the vibration of said contact servmg durin said vibration one 0 said A. re ays controls 'the' operation of another rela' said last mentioned means comprising a re ay having a movable 'contact. in circuit with said other relay..'

1. signaling lsystem' comprising, two lines, a repeater-therefor and normally con: nected for transmission in one direction therebetween, a switch between each line and said repeaterjwhereby the two-way transmission of signals is'possible, said-switches haying inde endently movable contacts, a voice relay or each of said lines. and conhndfmeiins whereby to efl'ectively deenergizje' solenoid relays control the connection of said re eater said means comprising a nections whereby each of said relays is adapted to operate both of said switches and to render the other relay inoperative.

5. In a telephone repeater system, a switch comprising a pair of windings, an armature controlled thereby, a source of current for said windings, two sets of vibrating contacts, each set being in circuit with said source and with one of said windings, and an electromagnet controlling each of said contacts. v i

6. The combination of two telephone lines, a relay for each of said lines, mechanically independent armatures for said relays,.a repeater for transmitting current in both directions between said hnes, means whereby said rela s control said repeater, and means whereby one of said relays controls the operation of the other relay, said repester being connected to transmit current in only one direction between said lines in the absence of current to be re ated.

7. The combination of two to ephone lines, a relay for each of said lines,-a unilateral repeater for transmitting current in both directions between said lines, means whereby said rela s control said repeater, and means where y one of said relays controls the operation of the other relay, said last mentioned means comprising an armature for one of said relays, a solenoid controlled thereby, and an armature for said solenoid in circuit with another of said relays.

8. The combination of two telephone lines, a relay for each of said lines, a" repeater between said lines, means whereby said relays control said repeater, and means whereby one of said relays controls the operation .of the other relay, each of said relays comprisin a vibrating contact, an auxiliary relay avin a solenoid and a movable contact, said so enoid and a source of current being in circuit with said vibrating contact the vibration of said contact serving to c ange the resistance in circuit with said a xiliary relay and 0 rate said contact to aa'ect. the operation 0 another of said .first mentioned relays.

9. The combination of two telephone lines, a relay'for each of said lines, a repeater between'said lines and normally connected for repeatin in one. direction therebetween, means w ereby said role 3 control said repeater, and means where y one of said-relays controls the operation of the other relay.

10. The combination of two telephone lines, a relay for eaohof said lines, said relays having mechanically independent armatures, a repeater between said lines and normally connected for repeatin in one direction therebetween, means w ereby said relays control said repeater, and means whereby oneof said relays controls the operation of the otherrelay. w

11. The combination .of two. telephone lines, a relay "associated with each of said lines, a repeater adapted to be connected between said lines and controlled by said relays, said repeater being normally connected for transmission in one direction between said lines, each relay being responsive to current in its corresponding line to render the other relay inoperative.

12. A signalin system comprising two lines, a repeater t ierefor and normally connected for transmission in one direction therebetween, a switch between eachling and said repeater whereby the two-way trains mission of signals is possible, a voice relay for, each of said lines, each of said relays being adapted to operate both of said switches and to render the other relay inoperative.

13. A signalin system comprising two lines,'a repeater t erefor and normally connected for transmission in one direction therebetween, a switch between each line and said repeater whereby the two-way transmission of current is possible a vibratile A. C. zela for each of said lines,

and connections w ereby each relay operates one of said switches and renders the other 1 relay inoperative.

14. A repeating system comprising two telephone lines terminating in mature,

electromagnetic means for contro ing said armatures, vibratile contact relaysifor controlling said means, and a repeater adapted to be connected between said lines and controlled by said relays, each relay responsivej to current in its corresponding line to render the other relay said repeater being effectively connected to efiiciently transmit current in one-direction between said lines in the absence of current to be repeated.

15. The combination of two telephone; lines terminating in annatures, elcctrogpa'g;

inoperative and netic means for controlling said armatnresQ vibratile contact rela s for controlling ."said means, a re ater adiipted to be connected between sai lines, means whereby said re lays control said repeater, and means whereby one of said relays controls the operative- I mess ofthe other relay, one side of one of said lines being connected to an output terminal of said repeater in the absence of current to be re ated, and one of said armatures connecting the other side f said one line to another output terminal of said repeater in the absence of current-to .be repeated.

16. A repeating system telephone lines terminating in armatures electromagnetic means for controlling said armatures, vibratile contact relays for controlling said means, and a repeater adapted to be connected between said lines and controlled by said relays, each relay being sponsive to current .in its correspondingcomprising two i p line to render the other relay inoperative one side of one of said lines being c'onnecte to an output terminalof said repeater in the absence of current to' be repeated, and

one of said armatures connecting the other.

side of said one line to another output terminal of said repeater in the absence of current to be repeat/ad.

17. A line, a unidirectional repeat/er adapted to be reversibly connected therein a shunt circuit deriving current from 'sai line, and connected to said line in the absence of current to be repeated, said cir- 2 for controlling said contact.

peater having output terminals normally connected to one of said lines and input terminals normally disconnected from said line, a voice relay deriving-current from said one line for controlling the connection of repeater to said lines, and means comprising a movable armature for rendering said relay unresponsive to current appreaching said repeater'over t'heo'ther of said .lines while permitting said relay to respond to current approaching the repeater over said one line.

a In witness whercofll hereunto subscribe ilxgi lname this 29th day of December A. D.

EDGAR n. JOHNSON. 

